package utils;

import book.Book;
import com.bit.utils.FileUtils;
import constant.Constant;

import java.io.IOError;
import java.io.IOException;
import java.time.LocalDate;
import java.time.LocalDateTime;

public class AnalyzingBook {
    public void storeObject(Book[] books, String filename)throws IOException{

        int booksUseLen = 0;
        for (int i = 0; i < books.length; i++) {
            if(books[i] != null){
                booksUseLen++;
            }

        }
        StringBuilder jsonArray = new StringBuilder();
        for (int i = 0; i < booksUseLen; i++) {
            if(books[i] != null) {
                jsonArray.append(books[i].toJSON());
                if (i != booksUseLen-1) {
//⼀本书籍完成后以\n进⾏分割
                    jsonArray.append("\n");
                }
            }
        }
        FileUtils.writeFile(jsonArray.toString(),filename);
    }
    public Book[] loadObject(String filename) throws IOException {
//从⽂件读取数据
//1. 从⽂件读取数据
            String content = FileUtils.readFile(filename);
            if (content == null || content.isEmpty()) {
                System.out.println("File is empty or does not exist: " + filename);
                return null;
            }
//2. 使⽤\n作为分隔符进⾏字符串分割
            String[] bookJsonStrings = content.split("\n");
//3. 把对应字符串“组装”成书籍对象
            Book[] bookList = new Book[bookJsonStrings.length];
            for (int i = 0;i < bookJsonStrings.length;i++) {
                Book book = parseBookJson(bookJsonStrings[i]);
                bookList[i] = book;
            }
            return bookList;
    }

    private Book parseBookJson(String json) {
        String[] pairs = json.split(",");
        //Book book = new Book();
        int bookId = Integer.parseInt(pairs[0]);
        String title = pairs[1];
        String author = pairs[2];
        String category = pairs[3];
        int publishYear = Integer.parseInt(pairs[4]);
        boolean isBorrowed = Boolean.parseBoolean(pairs[5]);
        int borrowCount = Integer.parseInt(pairs[6]);
        LocalDate shelfDate = LocalDate.parse(pairs[7]);
        //4. 构造书籍对象
        if (title != null && author != null && category != null && shelfDate != null) {
        Book book = new Book(title, author, category, publishYear, shelfDate);
        book.setBorrowed(isBorrowed);
        book.setBorrowCount(borrowCount);
        book.setBookId(bookId);
        return book;
        }
        return null;

    }

    public static void main1(String[] args) {
        Book[] books = new Book[4];
        books[0] = new Book("java", "gaobo", "编程", 1994, LocalDate.of(2023, 9, 24));
        books[1] = new Book("mysql", "lisi", "编程", 1999, LocalDate.of(2024, 2, 10));
        books[2] = new Book("php", "gaobo", "编程", 2020, LocalDate.of(2023, 9, 23));
        books[3] = new Book("西游记", "吴承恩", "⼩说", 2024, LocalDate.of(2023, 9, 23));

        AnalyzingBook analyzingBook = new AnalyzingBook();
        try {

            //存储书
            analyzingBook.storeObject(books,Constant.ALL_BOOK_FILE_NAME);
            //读书
            Book[] ret = analyzingBook.loadObject(Constant.ALL_BOOK_FILE_NAME);
            for (int i = 0; i < ret.length; i++) {
                System.out.println(ret[i]);
            }
        } catch (IOException e) {
            throw new RuntimeException(e);
        }
    }

}
